FM Transmitter

FM Transmitter Project

 Image of FM Transmitter

Rain Alarm Circuit Diagram

Circuit Diagram of FM Transmitter

The circuit uses only single Transistor but good voice quality. This Circuit is very simple and uses few components. Main part of the circuit is LC  ( Coil Capacitor ) Tank circuit to produce RF at required Frequency band. A transistor is used to power the LC circuit. The resonant frequency for an LC tank circuit is f = 1/(2pi * sqrt(LC) )

At FM receiver Device, Radio waves(oscillating magnetic lines) produces current in Arial. Which is further amplified, Demodulated and feed to a Speaker.
 
 
Part List :
Capacitor :
10 Mfd, .01 Mfd, .001Mfd, 2.2pf, 4pf, 5pf, 27pf, 68pf
Coil : 6-7 Turns using 26 SWG Wire
Resistance :
3.3K, 2.7K, 3.9K, 220 Ohms
Transistor=494B
Mic = Condenser Mic
3V battery with Container, Switch
Arial

 

This Video explains how Radio waves are produced.

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